Best Answer: I have been a police officer for almost 40 years. Just like civilian communication, police communication has evolved over the years, Before two-way radios, officers could call into headquarters on call boxes, which were located at various locations on their beats. was just wondering, how exactly did police officers communicate with one another before cellphones were widely used (early 70s era specifically)?
3 Stars. Nitroglycerin is used to treat congestive heart failure, to help prevent frequent chest pain caused by a heart condition known as angina, and to relieve pain caused by chronic anal fissures. The drug is available under the brand names Nitromist, Nitrobid, Nitro-Dur, Nitrostat, Imdur, Isordil and Rectiv.
Nitro-Dur Â® (nitroglycerin patch) is a prescription skin patch approved to help prevent attacks of angina, which is chest pain caused by inadequate blood supply to the heart. In the unlikely event that the patch comes off, simply replace it with a new one, treating the patch as if it were the old one and removing it at your regular time. 2  For Nitro-Dur to work properly, it must be used as prescribed.